I'll third what the others have said. Not to deflate your hopes, but you should prepare yourself.
My ah did rehab last sept. Initially he was on a post rehab high (common I'm told) and was ammmmazing. But he couldn't sustain it. I had no idea how hard his struggle was going to be - and how low I needed to keep my own expectations. I though taking the alcohol away would magically fix everything and he'd be a 'normal' healthy person, with 'normal' healthy responses. Not so.
He is now 6 months post rehab, some weeks are ok, some bad, some good.
We talked about my expectations and made some 'home' agreements about what jobs we each did...it's as basic as that.
I hope all goes well. Today I wouldn't say I regret letting him come home, but there have been plenty if days that I have.